Same game for different region sorting

[SysopGrace]

I've come to a problem that I'd like some help with in solving.

I've got many games that exist in both USA and Europe regions but I'd like to only keep the USA version of them. For ROMs which a USA version does not exist I'd like to retain the Europe version. Is there a trick to doing this?

[Wanderer]

Is there a trick to doing this?

So far, they only known way to achieve that, is to create a datafile with the ROMs you wish and then create the database from it.

[SysopGrace]

thank you very much for your help. i've been manually doing them. so far its not a big problem unless its the NES. but i haven't touched on many popular consoles yet.